Method of and means for drying paper.



i A. H. WHITE.

METHOD OF AND MEANS FOR DRYING PAPER.

APPLICATION FILED MAY 29,1915.

1,23%, M1 Patented July 3, 1917.

3 SHEETS-SHEET I.

QQ 7 M A H. WHITE.

METHOD OF AND MEANS FOR DRYING PAPER.

APPLICATION FILED MAY 2911915.

1,262, 141 Patente d July 3, 1917.

3 SHEETS'SHEET 2.

5 n we w toz A. H. WHITE.

METHOD OF AND MEANS FOR DRYING PAPER.

APPLICATION FILED MAY 29,1915. 1,Q3Q,141 Patented July 3,1917.

3 SHEETS-SHEET 3.

$513 (lite Mama UNITED STATES. PATENT orrron.) A I AMBROSE H.WHITE,

COMPANY, A CORPORATION OF NEW YORK.

METHOD OF AND MEANS FORDRYING PAPER.

Application filedllay 29, 1915. Serial No. 31,143.

ing of the paper web in itspassage through the drying part of papermaking machine,

which part of the machine consists usually of a number of hollowinternally heated drying cylinders disposed in two series, one above theother, and arranged to receive the damp web from the wet end of the apermaking machine, and over and around which cylinders the web travels andis subjected to a drying action, the web being supported in its travelby means of bands or aprons known as drier felts. The disposition andarrangement of these parts is such that pockets will be formed betweenthe adjacent cylinders of one series and the opposed cylinder of theother series, the sides of which pockets are formed by the traveling webas it passes cylinders to the next around the opposed cylinder. In thedrying action of the cylinders on the web, the heat of the cylindersexpels the moisture, and various expedients have been resorted to topelled moisture, as its presence in the room is very objectionable formany reasons, mainly because of its reabsorption by thepaperweb, itsdeposit on the machine, the intense heat created in the room, and thedeposit of the moisture on the roof plankin and other parts of the room.These con itions, more particularly the absorption of the moisture bythe web, greatly retard the drying of the paper. As far as I am aware,however, such expedients have not, in practice, proved en tirelysatisfactory.

My invention aims to overcome the objections mentioned and it consistsof an im-.

roved method of expediting and facilitat-v mg the drying of the paper,by subjecting the same to the action of a blast of air, applied inthepocket between adjacent drying cylinders, whereby the air will absorbmoisture from the web, and then abstracting the Specification of LettersPatent.

Methods of and of which the fol-' from one of the adjacent get rid ofthis ex Patented Jul 3, 19m.

moisture-laden air from the pocket by a suctlon action operated in saidpocket.

My invention consists also of means for carrying said method intoefiect, said means consisting of the combination with adjacentcylinders, over and around which the paper web is adapted to travel,thereby forming a CF BROOKLYN, NEW YORK, ASSIGNOR T0 INTERNATIONAL PAPERpocket between the cylinders, of blast means 1 located in said pocketand acting to deliver a blast of air therein so that the air will absorbmoisture from the web, and a suction means also located in saidpocketand acting to exhaust the moisture laden air therefrom. I Iprefer, as illustrated in the accompanymg drawings, to employ a blastmeans in the form of a pipe extending longitudinally of the, cylindersand having openings, through which the blast willbe delivered in adirection contrary to the travel of the paper from one cylinder, and toemploy a suction means of like form extending longitudinally ofthecylinders with the openings in the pipe disposed to draw themoistureladen air from the pocket in a direction contrary to the travelof the paper web to the next cylinder. r

' It will be manifest, however, to the skilled mechanic, that thedetails of the apparatus may be variously changed and modified withoutdeparting from the limits of my invention, rovided the operation issubstantially as indicated above, and further it will be understood thatmy invention is not limited to any particular form of construction ofthe parts nor as to the method of procedure except in so far as suchlimitations are specified in the claims.

In the accompanying drawings:

Figure 1 is a side elevation of the drying partof a paper making machineprovided with means for carrying my improved method into effect. I

Fig. 2 is a dia rammatic view of the, same on a reduced sca e, theframe-structure and certain other parts being omitted to betterillustrate the operation of my invention.

Fi 3 is 'a top plan view of the system of distributing and return pipesemployed for introducing the dry air and abstracting the moisture ladenair. a

Fig. 4 is a view on an enlarged scale to better illustrate the methodinvolved.

Referrin to the drawings:

'Fig. l ilustrates the drying part of a paper making machine which partconsists,

as usual, of an upper series of drying cylinders 1, P, 1*, etc., and alower series of dry ing cylinders 2, 2, 2*, etc, which cylinders areinternally heated and are mounted for cylinders by means of a drier feltin the form of an endless band or apron 4 passing around the uppercylinders and around guide rollers 5 between the cylinders, and the saidweb being supported against the lower cylinders by means of drier feltin the form of an endless band or apron 6, passing around the lowercylinders and guided around rollers 7 between said cylinders. As thusdisposed, pockets will be formed between the two series of cylinders,the alternating pockets 8 being closed at their lower ends by the lowercylinders and at their upper ends by the upper drier felt, and theintermediate pockets 8 being closed at their upper ends by the uppercylinders and at their lower ends by the lower drier felt, the sides ofthe pockets being formed by the paper web where the latter extends fromthe cylinders of one series to those of the other series. The abovedescribed mechanism is one commonly employed to subject the damp paperweb to a drying action, and the cylinders being rotated in the directionof the arrows, the web will travel back and forth around and between thecylinders of the two series, said web passing downwardly from the innerside of one of two adjacent cylinders of the upper series, then aroundopposing cylinder of the lower series, and up around the inner side ofthe other adjacent cylinder of the upper series, the heat of thecylinders acting to expel the moisture from the damp web, which escapesin form of vapor or steam.

In carrying my improved method into effect in connection with anapparatus of this form, I introduce into the pockets, as shown moreparticularly in Fig. 4, by a suitable blast means 9, a blast of airwhich issues in a direction opposite the travel of the paper from thecylinder 1, the blast being preferably directed toward the contractingspace between the web and the adjacent side of the drier felt. The airthus delivered under pressure will absorb mois-' ture from-the damp web,and by impinging against the web and felt, will be deflected and willflow in a stream or eddy laterally toward the opposite stretch of theWeb, where the latter passes onto the next cylinder 1. At this point,and in accordance with my method, the moisture-laden air is instantlyabstracted by a suction action operating through a suction means 10which draws in the air, as indicated by the arrow in a directionopposite the travel of the web onto the cylinder 1, and generally awayfrom the contracted space between the drier felt and the web at thatside. The effect of this method of procedure is to supply to the pocketa quantity of air, which, after acting .on the damp web and absorbingthe moisture therefrom, is instantly exhausted from the pocket. As aresult, the moisture of the air is revented from being reabsorbed by thewe or being deposited in the machine or room, the temperature of theroom will be ing action of the cylinders on the web will be made moreefficient, and the drying of the paper greatly expedited. By reason ofthe fact that the blast of air and the suction of the moisture-laden airact in directions contrary to the travel of the paper, there will belittle or no liability of the moisture being deposited or entrapped inthe gradually contracting spaces between the two stretches of the weband the intermediate drier felt.

In the form of apparatus shown, the blast and suction means are in theform of perforated pipes, as illustrated more particularly in Fig. 3,which pipes are extended into the pockets, respectively at oppositesides of the same, and longitudinally of the cylinders, the perforationsin the two pipes facing, respectively, the spaces between the web andopposite sides of the drier felt, so that the blast will be directedinto the space at one side opposite the travel of the paper at thisside, and the suction will be drawn from the space at the opposite sidein a direction opposite the travel of the paper at that side. Theseveral blast pipes 9 are connected at their ends to branch pipes 9extending upwardly and connected at their upper ends to horizontalsupply pipes 9",

.which, in turn, connect with a mam supply pipe 9 leading to the forceside of a blower or fan 12. The suction pipes 10 are connected at theirends to branch pipes 10 1eading upwardly and connected to a horizontalsupply pipe 10 connected, in turn, to a main supply pipe 10 leading to atrunk 13, which latter is connected to the suction side of the fan, anair washer 14 and an air heater 15 being arranged in. said trunk. Bythese means, the moisture laden air drawn from the pockets, is subjectedto a washing and drying action, and is returned in" d condition to thepockets through the blast pipes,'the air being thus continuouslycirculated through the pockets.

Instead of the blast and suction means operating in alternate pockets 8closed at their upper ends by the upper drier felt, it will be manifestthat these means may op- 80 prevented from rising unduly, and the dry?crate in the intermediate pockets closed at their lower ends by thelower felt as shown by dotted lines to the left in Fig. 2, or they maybe applied to operate in both sets of pockets, or in certain pockets ofone set and in certain pockets of the other set, provided that theoperation and method of procedure will be substantially as above setforth. Further it will be manifest that instead of directing the blasttoward and operating the suction in a direction from, the spaces betweenthe opposite sides of the Web andthe intermediate drier felt at one endof the pocket, they may be applied to operate at the opposite end of thepocket, between the respective stretches of the web and the ad j acentsurfaces of the drying cylinders.

Having thus described my invention, what I claim is:

1. The method of expediting the drying of paper in paper drying machinesemploying drying cylinders, around which the paper web passes and formspockets between the cylinders which consists in subjecting the side ofthe paper, at a point in the pocket where it passes from the dryingcylinder, to

a blast of air acting in a direction contrary to the travel of thepaper, whereby the moisture of the paper will be absorbed by the air,and abstracting said moisture-laden air by subjecting the same side ofthe paper but at a different point in its length, to a suction actionoperating in the pocket in a direction contrary to the travel of thepaper.

2. The method of expediting the drying of paper in paper drying machinesemploying drying cylinders, and "in which the paper web passes in theloop from one cylinder to another adjacent cylinder around anintermediate opposed cylinder, which method consists in directing ablast of air against the side of the web where the web passes from onecylinder at the beginning of the loop,

whereby the air will become moisture-laden and will be caused to flowlaterally toward the cylinder, onto which the web passes aftercompleting the loop and abstracting said moisture-laden air by a suctionaction operating adjacent the said last named cylinder.

3. The method of expediting the drying of paper in paper making machinesemploying drying cylinders, and in which the paper web passes in a loopfrom one cylinder to another adjacent cylinder around an intermediateopposed cylinder and is pressed against said cylinders by an apron orband, which method consists in directing a blast of air in the spacebetween the web and apron at the point where the web leaves onecylinder, at the beginning of the loop and in a,

direction contrary to the travel of the web, whereby the air will becomemoisture-laden and Wlll flow toward the cylinder, onto which the webpasses after completing the loop and abstracting said moisture-laden airby a suction action operating between the web and apron at a point wherethe Web passes to the said last named cyllnder and in a directioncontrary to the travel of the web.

4. In an apparatus for drying paper, the combination with upper andlower seriesof drying cylinders between and around which the paper webis adapted to travel, thereby forming a pocket between adjacentcylinders of one series and an opposed cylinder of an other series, of ablast means located in said pocket at one side to supply air thereto,whereby the air will absorb moisture from the web, and a suction meanslocated in said pocket at its other side, to abstract the moisture-ladenair.

.6. In an apparatus for drying paper, the combination with upper andlower series of drying cylinders between and around which the paper webis adapted to travel, thereby forming a pocket between adjacentcylinders of one series and an opposed cylinder of the other series, ofa blast means located in said pocket acting to deliver a blast of air,whereby the air willabsorb the moisture from the web, and suction meansalso located in said pocket and acting to abstractzthe moistureladen airtherefrom. 7. In an apparatus for drying paper, the combination withupper and lower series of drying cylindersbetween and around which thepaper web is adapted to travel, thereby forming a pocket between adjacent cylinders of one series and an opposed cylinder of the otherseries, a blast means located in said pocket and acting to deliver ablast of air adjacent one cylinder in a direction opposite the travel ofthe paper web from said cylinder, whereby the air will absorb moisturefrom the web, and a suction means also located in said pocket and actingto abstract the moisture-laden air adjacent the other cylinder and in adirection opposite the travel of the web thereto.

8. In an apparatus for drying paper, the combination of adjacent dryingcylinders over and around which the paper web is adapted to travel,thereby forming a pocket between the cylinders, blast means located insaid pocket and acting to deliver a blast ture from the Web, and asuctionriineans also located in said pocket and acting to exhaust themoisture-laden air in a direction opposite the travel of the paper. a

9. In a machine for drying paper, the

5 combination of adjacent drying cylinders over and around which thepaper Web is adapted to travel, thereby forming a pocket between thecylinders, and an apron or band to press the web against the cylinder,said apron or band being spaced from the web inders and in a directionopposite the travel of the web from said cylinder, whereby the air willabsorb moisture from the web, and suction means located in said pocketand acting to exhaust the moisture-laden air from the space between theweb and apron adjacent the other cylinder and in direction opposite thetravel of the web to said latter cylinder.

10. In a paper drying machine, the com- 25 bination of adjacent dryingcylinders over and around which the paper web is adapted to travel,thereby forming a pocket between the cylinders, a blast pipe extendingwithin said pocket longitudinally, of the cylinders and acting todeliver a blast of air therein,

whereby the said air will absorb moisture from the Web, and a suctionpipe also extending within said pocket longitudinally of the cylindersand acting to exhaust the moisture-laden air therefrom;

11. In a paper drying mechanism the combination with upper and lowerseries of drying cylinders over and around which the paper web isadapted to travel, thereby forming a pocket between the cylinders, andan apron or band acting to press the web against the cylinders andclosing the upper end of said pocket, a blast means located in saidpocket and acting to deliver a blast of air into the same, whereby theair will ab-- sorb moisture from the Web, and a suction means alsolocated in said pocket and acting to abstract the moisture-laden airtherefrom.

12. In a paper drying mechanism the combination of adjacent dryingcylinders over and around which the paper web is adapted to travel, anda band or apron to press the web against the cylinders, said parts beingdisposed to form a pocket be tween the cylinder closed at its upper end,a blast means located in said pocket and acting to deliver a blast ofair therein, whereby the air will absorb moisture from the web, and asuction device also located in said pocket and acting to abstract themoisture-laden air therefrom.

signature.

In testimony whereof, I have afiixed my.

